Many times when dealing with families, it is necessary to create an angle dimension and then lock it at 90°. Similar to the lock for alignment, it seems it would be invaluable to all who deal with families to have the ability to click a little "lock at 90°" toggle.
Make it a tiny little icon nested near the intersection of the two elements. When toggle is on, it looks like a 3:4:5 triangle. When toggle is off, it looks like an obtuse angle.
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